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Finding the Fourth Proportional to 19,985.28, 29,978.04 and 8,889.36

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Solution

The fourth proportional to 19,985.28, 29,978.04 and 8,889.36 is: 13,334.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,985.28 : 29,978.04 = 8,889.36 : x
  2. Step 2: Convert to fraction form
    19,985.28/29,978.04 = 8,889.36/x
  3. Step 3: Cross multiply
    19,985.28x = 29,978.04 × 8,889.36
  4. Step 4: Simplify right side
    19,985.28x = 266,485,589.65
  5. Step 5: Solve for x
    x = 266,485,589.65/19,985.28
  6. Step 6: Final answer
    x = 13,334.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.